It partly comes down to how competitive you are. If you're playing at a low level then who cares because you've still got plenty of other stuff that can make a bigger difference, but when you're climbing up the ranks and you've got all the big stuff in terms of technique as down as you can get it, you'll naturally start looking for more ways to improve. At a low level, that one inch wont make any difference. At the highest levels, that one inch could be the place you get hit in the one on one tiebreaker in an international series final decider. At that level you do everything you can.